Mechanism foe



Sept. 1l, 1934- i o. KLExNscHMx-r ET AL 1,972,999

MECHANISM FOR PRODUCING LOOPED KNOTS IN THREAD KNOTTING MACHINES FiledSept. 20, 1950 2 Sheets-Sheet l Sept# 11, 1934 o. KLEINSCHMIT Er AL1,972,999

MCHANISM FOR PRODUCING LOOPED KNOTS IN THREAD KNTTING MACHINES FiledSept. 20, 1930 2 Sheets-Sheet 2 Patented Sept. 1v1, 1934 -WTEgD STATES1,972,999 MEonANrsM Foa PinoDUoiNG LooPED H KNors 1N CHrNEs Kleinschmitand Gslar Mller, Leipzig- Y. .e1agwitz,.-G9rmany, ,assig'nors to.Gehruder Brehmer, LeipzigPlagvvitz, Germany, aGerman ApplicationSeptember 20, 1930, Serial No. 483,371 Y -IniGermany May 17, 1930 11claims.

the like, and it is also known to use mechanism-- comprising acombination of thread-looping needles and a self-releasingthread-gripper in order to attain this end.

The'object-of this invention is to improve themechanism of 'suchmachines in a manner such According to this invention, thread-grippingmechanism is provided whereby the closing thread is automatically loopedinto the tighten-..1

ing loop of the safety-knot. during the formation of thellatter.

In orderthat the above description may be beti ter understood vtheinvention isshown in the accompanying drawings embodied by way of ,exam-Figs. `5 and'G are `viewsof the thread-gripperv as used for theformationof ya,l0op ed safetyknot,

Fig. 7 is a view, drawn to a larger scale, of the;

'l1 (Fig. 8) vIn thiscase, however, the mouthof ythe gripper 6 -mustbeso shaped that, in the tightjaws of;suchf af gripper.

Fig. 8 is a View showing the improved type of" gripper drawing thelooped end of the thread through the initial loops of a loopedsafety-knot.

Fig. 9 shows the gripper reversing its stroke in order to carry thelooped end to the left, to

tighten the knot,

Fig. 10 shows the gripper freeing itself from the thread loop whilstcarrying the latter to the knotted thread formed by mechanism having twoneedles.

.. Referring to Figs. l and 2, it will be seen that .in orderto form asaety-knotin the known manner, the thread l supplied from the spoolisdrawn outbythe threadguide 2 and successivelyplaced onto the.vertically reciprocating hookneedles 3,

,4, 5.- Thethr-ead-loop, formed by the needle 3,v 'is made relativelylong and then formed into, the Vdouble loop 'Las shown in Fig. 2, inknown.. manv ner, by parts A (which here are of no particularinterestand are only indicated in the drawings) .to enable the gripper.B to pass therethrough and .nally to. seize the endof the threadwhichvhas been cut.oii.in'.the meantime and is hanging in the needle5... Thegripper now .pulls the vthread members are pulled, tight in v ayknown manner the part 'la of the thread loop lin order that thesafety-knot shown in Fig.. 4 may be formed. For

--along,.if. need be, throughthe loopof, the needle `Il, and. onreaching aposition sufficiently .farto Athe rightof.. needle 3 soas toenablethe end of the .thread to slip .out or. the `loop 7, the thread f-(Fig. 3) to form the knot. In thisoperation the Ygripper 6 movestothelef-t again, vthrowing over this manipulation, the end of the threadmust be l held ink thegripper very firmly andthisis effected bythethread being clampedin-the gripper #so that it-cannot slip off. but isgradually pulled outward. V2in order to prevent `slipping of, the

vertically upward* direction;

The automatic formation of the looped safetyknot "shown in Figs..8 to 11is rendered possible seized by the gripperand drawn through the Vloopby-the en d a of the thread being rleft of sumcient length, solas not toslip outv of the loopv b when ening movement to the left, the closedloop can move out of the mouth of the gripper. This slipping movement ofthe thread from the mouth of the gripper as the latter advances to theleft will be readily seen from Fig. l0. The fixed jaw e of the holdingjaws is provided` with an oblique groove c (Figs. 5, 6 and '7) intowhich the knot-closing loop is pulled as the gripper moves to the rightafter seizing the thread. This loop is thus not situated in thelongitudinalA vertical plane of the gripper but is inclined there'-J to.That is to say, the lower extremity of the groove extends to one lateralface of the jaw e so that the loop held in the groove c lies to one sideof the nose or xed jaw e as shown in Fig. 9. If, now, the gripper ismoved to the left for tightening the knot (Fig. 9) the point of theformer in consequence of the obliquity of the loop, passes behind thelatter as shown in Fig. 10. The holding jaw d. of the gripper mouth isslightly bevelled outwardly so that the vloop is caused, by the pullingforce thereon, to slidev outward and so to slip out of the mouth.

By this constructional alteration of the gripper it is possible toenlarge greatly the scope of usefulness of thread-knotting machines. Forexample, the masses of cards designed for use on festive or likeoccasions and provided with knotted bows which hitherto had to be tiedby hand, can by this means be readly produced in much shorter time. f

I claim:

1. A thread-gripper for use in a thread-knotting machine comprising ahorizontal reciprocating member, a lxed jaw formed at the forward end ofthe said member and having a slot formed therein at an oblique angle tothe longitudinal vertical plane of the said gripper, and a movable jawadapted to co-operate with the said fixed jaw.

2. A thread-gripper for a thread-knotting machine, comprising ahorizontal reciprocating member, a fixed jaw formed at the forward endof said member having side faces bevelled obliquely to the direction oftravel of the said member vand a rear face slotted at an oblique angleto the longtudinal vertical plane of the said gripper,

- and a movable jaw having its front face bevelled at an angle to thexed jaw and inclined toward a mouth leading to the said jaws.

3. A thread-gripper for a thread-knotting machine, comprising ahorizontal, reciprocating member, a tixed jaw formed at the end of thesaid member and having the lower edge of its rear face rounded, amovable jaw, a guiding member for the said movable jaw recessed at itsforward end to form, in association with the ixed jaw, a guiding mouthfor the thread. v

4. A thread-gripper for use in a thread-knotting machine, comprising asubstantially horizontal reciprocating member, a fixed jaw formed at theforward end of said member and having a rear face slotted at an obliqueangle to the longitudinal, vertical plane of said gripper, said slotextending laterally to emerge on a lateral face of said member, and amovable jaw associated with said xed jaw.

5. A thread-gripper for use in a thread-knotting machine, comprising asubstantially horizontal reciprocating member, a fixed jaw provided onsaid memberV and having the rear face of its lower edge rounded, saidface being slotted at an oblique angle to the longitudinal verticalplane of the gripper, a movable jaw associated with said xed jaw, and aguide for said movable jaw, said guide being shaped at its forward endto form in association with said iixed jaw a thread-guiding opening inone lateral face of said reciprocating member.

6. A thread-gripper for use in a thread-knotting machine, comprising areciprocatory member having a thread-receiving slot formed therein, theWalls of said slot being set at an oblique angle to the longitudinalvertical plane of the gripper, and extending laterally so that said slotopens on a lateral face oi' said member.

7. A thread-gripper for use in a thread-knotting machine, comprising areciprocatory member having one extremity formed with side facesbevelled obliquely to the longitudinal direction of travel of saidmember, said extremity of the member being slotted at an oblique angleto the longitudinal vertical plane of said gripper and extendinglaterally so that said slot opens on a lateral face of said member toreceive the thread.

8. A thread-gripper for use in a thread-knotting machine, comprising areciprocatory member, and thread-gripping jaws mounted upon said memberand adapted for relative displacement, a slot to receive the threadbeing formed in one of said jaws at an oblique angle to the longitudinalvertical plane of the gripper.

9. A thread-gripper for use in a thread-knotting machine, comprising areoiprocatory member,

a thread-gripping jaw mounted upon said mem-l ber adjacent one extremitythereof, and provided with lateral faces bevelled obliquely in thedirection of travel of said member, and a second jaw mounted upon vsaidmember and operatively asso-V ciated with said rst jaw, said rst jawhaving ai thread-receiving slot formed therein at an oblique angle tothe longitudinal vertical plane of the gripper.

10.Y A thread-gripper for use in a thread-knotting machine, comprising areciprocatory member, a fixed thread-engaging jaw positioned at oneextremity of said member and having a threadreceiving slot formedtherein at an oblique angle to the longitudinal vertical plane of saidgripper, and a movable jaw mounted upon said member and operativelyassociated with said xed jaw.

11. A thread-gripper for use in a thread-knotting machine, comprising areciprocatory member, a thread-engaging jaw positioned at one extremityof said member and having a thread-receiving vslot formed therein atanoblique angle to the longitudinal vertical plane of said gripper, asecond jaw slidably mounted upon said member and operatively associatedwith said rst jaw, and

a guiding member for said movable jaw recessed to form in associationwith the iixed jaw a guiding mouth for the thread.

OSCAR KQEINSCHMIT. OSKAR -MULLER.

